Shedding mechanism



Sept. 27, 193&

G. E. ULRICH 1 2,131,679

SHEDDING MECHANISM Filed ApriLSO, 1937 2 Sheets-Sheet 1 P 1938. G. E. ULRICH SHEDDI NG MECHANISM Filed Apiil so, 1937 2 Sheets-Sheet 2 harness carrier.

Patented Sept. 27, 1938 UNITED'ISTATES This invention aims to provide novel means for eliminating the harness straps and the elevated dobby at oneside of a loom, therebygiw ing the weaver more light and affording a better opportunity to oversee the warp and tie'in brokenends. The structure shown in this application and hereinafter described will eliminate smashes and other difficulties caused by broken harness straps. Time is saved in'changing the harness'in a loom, since there are no springs to be tied in, and the harness'will not have to be levelled, the harness always being in such a position that little if any adjustment will be required. i

A further object of the invention is to dispense with uneven shedding in broad looms,

caused by the difference in length of the harness straps. 7

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invenembodying the invention, parts being in section;

Fig. 2 is a vertical section showing the guiding. means for the harness carrier;

Fig. 3 is a horizontal section taken through the structure depicted in Fig. 2;

Fig. 4 is a vertical section disclosing the adjustable connection between the harness carrier and the base bar which is beneath it;

Fig. 5 is an elevation showing a portion of a loom wherein the present improvements have been embodied, the loom being a cam loom, rather than a pattern loom of the type disclosed in Fig. 1.

In Figs. 1 to 5, the numeral I indicates the necessary parts of a loom frame, and the harness is shown at 2. The harness 2 is seated in a harness carrier 3, which is U-shaped in elevation, and channel-shaped in cross section. Spring actuated latches 4 on the upper ends of the side arms of the harness carrier 3 engage the end members of the harness 2 and hold it in the The side arms of the harness carrier 3 have external, vertically elongated guide slots 5," receiving the inner ends of guide pins 6 having shoulders 1 against which the outer edges of the harness carrier'ride, as the harness carrierreciprocates vertically. The guide pins 6 are threaded for longitudinal adjustment'into'the loom frame I, and are held in adjusted position by lock nuts 8. The numeral 9 marks a base bar located below the harness carrier 3. The harness carrier 3'is secured to the basebar 9, for Vertical adjustmentwith respect thereto, 'by screws I0, which are right and left hand threadedinto the base barand into the lower member of the harness carrier.

The structure above described is such that the harness carrier 3 and the'harness 2 will be so positioned that very little adjustment will be required to keep those parts in levelled position, for up anddown movement responsive to a means whi-chwill; be described hereinafter.

a Bell crank levers ll and I2 are fulcrumed at M on the lo'om, frame, below the base bar 9, the

. upper ends of links 15- being pivotedto the base bar, and the lower ends of the links being pivoted levers,those arms'projecting in the same direction. To the lower endsof the depending arms of the bell crank levers H andl2, a rigid connection I6 is pivoted. Prompt downward movement of the harness 2 and the carrier 3 is promoted by a pull spring l1, connected to one side to thelateral-ly extended arms of the bell crank of the loom frame I and to the depending arm the harness 2 from a place below the harness, the

means to that end differing structurally in the two forms shown, depending upon whether the .parts hereinbefore described are used upon a cam loom or upon a loom of the pattern chain type. Taking up first the simpler form of Fig. 5, it will be noted that the raising of the harness carrier 3a and the harness 2a is accomplished by providing the bell crank lever lZa with an outwardly projecting arm 3, cooperating with a cam l9 on a cam shaft 50.

In the form delineated in Fig. 1, driven shafts 20 and 2| are supported on the loom frame I, at the top of the frame, and at one side of the frame, in the position ordinarily occupied by the dobby, a pattern roller 22 being secured to the I shaft 20, and a pattern roller 23 being secured to the shaft 2|. The structure referred to presents less impediment to the weaver than does a dobby, located in a corresponding position; The pattern roller 22 carries a pattern chain 24, and the pattern roller 23 carries a. pattern chain 25. The pattern chain 24 has removable and shiftable pins or projections 26, and the pattern chain 25 is supplied with like pins or projections 21.

The pins 26 of the chain 24 cooperate with the depending arm of a bell crank lever 28, and the pins 21 of the chain 25 cooperate with a .lever 29, the levers having a common fulcrum at 30 r A link 3| has its upper end the mechanism M, in the machine under consideration, being located well below the harness 2 and associated parts, and out of theway of the weaver. the Hattersley dobby, introduced about 10 years ago, and therefore well understood by those skilled in the art, a lengthy description of the mechanism M is not necesary. Let it suifice to say that the said mechanism embodies vertically tiltable fingers 33 and 34, not actuated by the usual chain cylinder and chain, located closely adjacent to the fingers, but more remotely, from the pattern rollers 22 and 23. The lower end of the link 3| is assembled with the finger 33 for adjustment longitudinally of that finger, and the link 32 has a like relation to the finger 34. The jack 35 cooperates with the upper girt 36 and with the lower girt 31, to produce a reciprocatory movement in the direction of the arrows A of Fig. 1. Advantage is taken of that movement, not by. connecting the intermediate portion of the jack 35 to the usual harness lever which operates the harness straps, but by joining the intermediate portion of the jack pivotally, at 38, to one end of the connection l6. 7

The cam l9 and the arm N3 of the bell crank Since the mechanism M forms part of lever l 2a, together with the parts wherewith they are associated, raise the harness carrier 3a and the harness 2a, gravity and the effort of the spring I'la effecting a'downward movement of the harness carrier and the harness.

The general construction of the device is such that the objects set forth in the opening portion of. this specification will be consummated. The harness 2 is levelled easily by operating the screws l0, and the harness and the harness carrier 3 always have an accurate up and down movement. The space above the harness 2 is open, the weaver .always being able to view his work and tie in the ends, or do whatever is desired. Since the dobbyis'displaced from the position occupied by the rollers 22 and 23, ready access is had to the corresponding side of the loom. Disorders resulting from the old time harness strap structure are avoided.

Having thus described the invention, what is claimed 4 .7

1. In a device of the class described, a loom frame, a harness, a harness'carrier extended beneath and supporting the harness, means for guiding the harness carrier for up and down movement on the frame, a base member located below the carrier, means associated with the base member and with the carrier for securing up and down adjustment of the carrier with respect to the base member, and said means for guiding the carrier for up and down movement comprising guide members having longitudinal adjustment in the frame and comprising parts which engage the ends of the carrier, the ends of the carrier having elongated guide elements cooperating with the guide members.

2. In a device of the class described, a loom frame, a harnesscarrier which is U-shaped in elevation and channel-shaped incross section, a harness seated in thechannel of the carrier, means for guiding the carrier for up and down movement on the frame, and latch means engaging the carrier and the harness to hold the harness releasably seated" in the channel of the carrier. Y

' GUS E. ULRICH. 

